Canon Rumors just received a hint about a firmware update in the wild for the 5D Mark II:

I’ve been told that Canon lent 4 5D Mark II’s to a certain company with a firmware version not currently available.
The firmware is geared towards video. No word on whether or not some manual controls have been added.
I’ve been asked not to mention the industry or the project, so I won’t.

If anyone get one of these, please feel free to share them with me/us. 🙂